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243 senior principal mechanical design engineer jobs found

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AtkinsRéalis
Apr 12, 2026
Senior / Principal Mechanical Design Engineer
AtkinsRéalis Bristol, UK
Job Description Are you a Mechanical Design Engineer who thrives on leading the way on solving difficult engineering problems? Are you drawn to complex projects and excited by the opportunity to rapidly progress your technical leadership skills to the next level, heading up multi-disciplinary projects? If so, you might enjoy solving the energy industry’s most important mechanical engineering conundrums for a multitude of energy systems across a variety of clients. You could be Managing exciting projects designing test rigs in support of the development of the UKs nuclear fusion capabilities, carrying out structural integrity assessment of primary plant (for both civil and defence applications) to keep existing fleet generating, designing high integrity structures for new nuclear establishments, or leading one of many renewable energy projects across a growing carbon net zero portfolio. You’re likely to be juggling several projects simultaneously, so enjoying...
AtkinsRéalis
Apr 12, 2026
Senior / Principal Mechanical Design Engineer
AtkinsRéalis Derby, UK
Job Description Are you a Mechanical Design Engineer who thrives on leading the way on solving difficult engineering problems? Are you drawn to complex projects and excited by the opportunity to rapidly progress your technical leadership skills to the next level, heading up multi-disciplinary projects? If so, you might enjoy solving the energy industry’s most important mechanical engineering conundrums for a multitude of energy systems across a variety of clients. You could be Managing exciting projects designing test rigs in support of the development of the UKs nuclear fusion capabilities, carrying out structural integrity assessment of primary plant (for both civil and defence applications) to keep existing fleet generating, designing high integrity structures for new nuclear establishments, or leading one of many renewable energy projects across a growing carbon net zero portfolio. You’re likely to be juggling several projects simultaneously, so enjoying...
AtkinsRéalis
Apr 12, 2026
Senior / Principal Mechanical Design Engineer
AtkinsRéalis Epsom, UK
Job Description Are you a Mechanical Design Engineer who thrives on leading the way on solving difficult engineering problems? Are you drawn to complex projects and excited by the opportunity to rapidly progress your technical leadership skills to the next level, heading up multi-disciplinary projects? If so, you might enjoy solving the energy industry’s most important mechanical engineering conundrums for a multitude of energy systems across a variety of clients. You could be Managing exciting projects designing test rigs in support of the development of the UKs nuclear fusion capabilities, carrying out structural integrity assessment of primary plant (for both civil and defence applications) to keep existing fleet generating, designing high integrity structures for new nuclear establishments, or leading one of many renewable energy projects across a growing carbon net zero portfolio. You’re likely to be juggling several projects simultaneously, so enjoying...
AtkinsRéalis
Apr 12, 2026
Senior / Principal Mechanical Design Engineer
AtkinsRéalis Sheffield, UK
Job Description Are you a Mechanical Design Engineer who thrives on leading the way on solving difficult engineering problems? Are you drawn to complex projects and excited by the opportunity to rapidly progress your technical leadership skills to the next level, heading up multi-disciplinary projects? If so, you might enjoy solving the energy industry’s most important mechanical engineering conundrums for a multitude of energy systems across a variety of clients. You could be Managing exciting projects designing test rigs in support of the development of the UKs nuclear fusion capabilities, carrying out structural integrity assessment of primary plant (for both civil and defence applications) to keep existing fleet generating, designing high integrity structures for new nuclear establishments, or leading one of many renewable energy projects across a growing carbon net zero portfolio. You’re likely to be juggling several projects simultaneously, so enjoying...
AtkinsRéalis
Apr 12, 2026
Senior / Principal Mechanical Design Engineer
AtkinsRéalis Manchester, UK
Job Description Are you a Mechanical Design Engineer who thrives on leading the way on solving difficult engineering problems? Are you drawn to complex projects and excited by the opportunity to rapidly progress your technical leadership skills to the next level, heading up multi-disciplinary projects? If so, you might enjoy solving the energy industry’s most important mechanical engineering conundrums for a multitude of energy systems across a variety of clients. You could be Managing exciting projects designing test rigs in support of the development of the UKs nuclear fusion capabilities, carrying out structural integrity assessment of primary plant (for both civil and defence applications) to keep existing fleet generating, designing high integrity structures for new nuclear establishments, or leading one of many renewable energy projects across a growing carbon net zero portfolio. You’re likely to be juggling several projects simultaneously, so enjoying...
AtkinsRéalis
Apr 12, 2026
Senior / Principal Mechanical Design Engineer
AtkinsRéalis Glasgow, UK
Job Description Are you a Mechanical Design Engineer who thrives on leading the way on solving difficult engineering problems? Are you drawn to complex projects and excited by the opportunity to rapidly progress your technical leadership skills to the next level, heading up multi-disciplinary projects? If so, you might enjoy solving the energy industry’s most important mechanical engineering conundrums for a multitude of energy systems across a variety of clients. You could be Managing exciting projects designing test rigs in support of the development of the UKs nuclear fusion capabilities, carrying out structural integrity assessment of primary plant (for both civil and defence applications) to keep existing fleet generating, designing high integrity structures for new nuclear establishments, or leading one of many renewable energy projects across a growing carbon net zero portfolio. You’re likely to be juggling several projects simultaneously, so enjoying...
Stantec
Apr 12, 2026
Senior or Principal Mechanical Design Engineer - Building Services
Stantec Exeter, UK
We are looking for a Senior or Principal Mechanical Engineer to join our dynamic and growing Building Services (MEP) team in Plymouth. Our team is lively, supportive, and enjoys working together while delivering exceptional work. This is a fantastic opportunity to join a friendly team that's not just passionate about engineering but also about creating a positive and collaborative work environment. We value diversity of thought and encourage innovative ideas from every perspective. We have built our pipeline of work to span a diverse range of sectors, from healthcare and education, to commercial, residential and industrial, providing variety that keeps us interested and constantly learning and evolving. We pride ourselves on a collaborative, proactive approach, working closely with clients to deliver award-winning and sustainable environments. Our MEP team is at the forefront of sustainable and high-performance building design and we have a strong track record of...
Stantec
Apr 12, 2026
Senior or Principal Mechanical Design Engineer - Building Services
Stantec Truro, UK
We are looking for a Senior or Principal Mechanical Engineer to join our dynamic and growing Building Services (MEP) team in Plymouth. Our team is lively, supportive, and enjoys working together while delivering exceptional work. This is a fantastic opportunity to join a friendly team that's not just passionate about engineering but also about creating a positive and collaborative work environment. We value diversity of thought and encourage innovative ideas from every perspective. We have built our pipeline of work to span a diverse range of sectors, from healthcare and education, to commercial, residential and industrial, providing variety that keeps us interested and constantly learning and evolving. We pride ourselves on a collaborative, proactive approach, working closely with clients to deliver award-winning and sustainable environments. Our MEP team is at the forefront of sustainable and high-performance building design and we have a strong track record of...
MWH Treatment
Apr 12, 2026
Senior/Principal Design Engineer - Mechanical
MWH Treatment Brighton, Brighton and Hove, UK
We are looking to strengthen our engineering team with a Senior Mechanical Engineer based at Brighton with hybrid working available.  You will report directly to the Principal Engineer and your role will be to provide superior quality Engineering Design services to allow the company to minimise risks and maximise profits on turnkey and engineering services contracts. You will co-ordinate the design and produce design documents and drawings taking due account of health and safety requirements, specifications and standards pertaining to the contract. Key responsibilities will include: Produce design layouts which are cost effective, meet the requirements of the specification and which can be constructed and commissioned effectively. The term ‘cost’ is to embrace all costs associated with the design and the subsequent construction of the design. To be cost effective the whole out turn cost of the design solution must be considered including design time costs, material costs,...
Stantec
Apr 12, 2026
Senior or Principal Mechanical Design Engineer - Building Services
Stantec Plymouth, UK
We are looking for a Senior or Principal Mechanical Engineer to join our dynamic and growing Building Services (MEP) team in Plymouth. Our team is lively, supportive, and enjoys working together while delivering exceptional work. This is a fantastic opportunity to join a friendly team that's not just passionate about engineering but also about creating a positive and collaborative work environment. We value diversity of thought and encourage innovative ideas from every perspective. We have built our pipeline of work to span a diverse range of sectors, from healthcare and education, to commercial, residential and industrial, providing variety that keeps us interested and constantly learning and evolving. We pride ourselves on a collaborative, proactive approach, working closely with clients to deliver award-winning and sustainable environments. Our MEP team is at the forefront of sustainable and high-performance building design and we have a strong track record of...
Stantec
Apr 12, 2026
Senior or Principal Mechanical Design Engineer - Building Services
Stantec Taunton, UK
We are looking for a Senior or Principal Mechanical Engineer to join our dynamic and growing Building Services (MEP) team in Plymouth. Our team is lively, supportive, and enjoys working together while delivering exceptional work. This is a fantastic opportunity to join a friendly team that's not just passionate about engineering but also about creating a positive and collaborative work environment. We value diversity of thought and encourage innovative ideas from every perspective. We have built our pipeline of work to span a diverse range of sectors, from healthcare and education, to commercial, residential and industrial, providing variety that keeps us interested and constantly learning and evolving. We pride ourselves on a collaborative, proactive approach, working closely with clients to deliver award-winning and sustainable environments. Our MEP team is at the forefront of sustainable and high-performance building design and we have a strong track record of...
RPS Group
Apr 12, 2026
Senior Electrical Design Engineers (Building Services)
RPS Group Leeds, UK
Senior / Principal Electrical Design Engineers (Building Services) RPS is currently seeking  Senior  or a  Principal level Electrical Design Engineer  (Building Services) to join either the team in our  Manchester, Leeds, Birmingham  or  Newcastle  office on a  hybrid basis .  About The Design Business: RPS Design Division delivers projects across multiple, niche sectors from residential housing developments, logistics, retail, aviation, healthcare, education, advanced manufacturing, data centres, energy and more as we strive to achieve the right balance between form and function when faced with competing priorities around sustainability, materiality, cost and constructability. Digitalisation is at the core of our delivery model allowing our clients and their stakeholders to really experience our designs right from project concept stage and through drawing on expertise spanning decades, industries and disciplines, we assist clients to harmonise design drivers...
RPS Group
Apr 12, 2026
Principal Mechanical Design Engineer (Water)
RPS Group Glasgow, UK
Principal Mechanical Design Engineer (Water) We are currently in the market to recruit multiple Principal Mechanical Design Engineers (Water) for a variety of major long-term frameworks across the UK. In addition to a range of long-term programmes across the UK water industry RPS, and Tetra Tech, have successfully won a £100 million single-award framework from United Utilities to support the improvement of river health across the Northwest of England. RPS has been working with United Utilities for over 20 years on innovative projects. As we move towards AMP8, this is an exciting time to be working in the water industry, and collaborating with passionate organisations, gives our people the opportunity to create positive change. Under this 10-year framework, RPS will drive program optimisation, develop solutions, and select the preferred options based on best value, lowest carbon, and cost. Our mission is to deliver exceptional water services to...
Pertemps Bond
Apr 12, 2026
Principal Mechanical Design Engineer
Pertemps Bond Reading, UK
Job title: Principal Mechanical Design Engineer – Water Sector Location: Reading Hours: 36 hours per week (Hybrid working available) Salary: £60,000 - £80,000 + £5,8000 car allowance An excellent opportunity has arisen for an experienced Principal Mechanical Design Engineer to take a leading role within a forward-thinking organisation supporting major water and wastewater infrastructure programmes. This position offers the chance to influence engineering strategy, guide standards, and provide expert leadership across technically challenging projects, while contributing to sustainable asset delivery and innovation in the sector. Role Overview The successful candidate will act as a senior technical authority for mechanical engineering, responsible for shaping project requirements, driving engineering quality, and delivering robust solutions. Key responsibilities include: Defining clear and accurate technical requirements to support effective project delivery Enhancing...
Glanua
Apr 12, 2026
Lead Electrical Design Engineer
Glanua Reading, UK
Lead Electrical Design Engineer - (Wastewater Treatment Projects) About Us: Glanua is an industry leader in providing innovative and sustainable engineering solutions to design, build, operate and maintain critical water and wastewater infrastructure across Ireland and the UK. We are a trusted provider to the municipal and industrial sector where our clients include Ireland and the UK's largest water utilities, Uisce Eireann (formally Irish Water), Thames Water, Yorkshire Water Affinity Water, Northumbrian Water and United Utilities. Glanua is passionate about solving today's environmental challenges and delivering a decarbonised and sustainable world. We know that to build successful creative teams we need a diverse workforce that can deliver new innovative ways of thinking. We provide an environment where you will have the freedom to develop and grow to your full potential. We champion our core values and uphold the highest standards of Safety and Well-being,...
RPS Group
Apr 12, 2026
Senior Electrical Design Engineers (Building Services)
RPS Group Newcastle upon Tyne, UK
Senior / Principal Electrical Design Engineers (Building Services) RPS is currently seeking  Senior  or a  Principal level Electrical Design Engineer  (Building Services) to join either the team in our  Manchester, Leeds, Birmingham  or  Newcastle  office on a  hybrid basis .  About The Design Business: RPS Design Division delivers projects across multiple, niche sectors from residential housing developments, logistics, retail, aviation, healthcare, education, advanced manufacturing, data centres, energy and more as we strive to achieve the right balance between form and function when faced with competing priorities around sustainability, materiality, cost and constructability. Digitalisation is at the core of our delivery model allowing our clients and their stakeholders to really experience our designs right from project concept stage and through drawing on expertise spanning decades, industries and disciplines, we assist clients to harmonise design drivers...
RPS Group
Apr 12, 2026
Principal Mechanical Design Engineer (Water)
RPS Group Sheffield, UK
Principal Mechanical Design Engineer (Water) We are currently in the market to recruit multiple Principal Mechanical Design Engineers (Water) for a variety of major long-term frameworks across the UK. In addition to a range of long-term programmes across the UK water industry RPS, and Tetra Tech, have successfully won a £100 million single-award framework from United Utilities to support the improvement of river health across the Northwest of England. RPS has been working with United Utilities for over 20 years on innovative projects. As we move towards AMP8, this is an exciting time to be working in the water industry, and collaborating with passionate organisations, gives our people the opportunity to create positive change. Under this 10-year framework, RPS will drive program optimisation, develop solutions, and select the preferred options based on best value, lowest carbon, and cost. Our mission is to deliver exceptional water services to...
RPS Group
Apr 12, 2026
Senior Mechanical Design Engineer (Water)
RPS Group Birmingham, UK
Senior Mechanical Design Engineer (Water) We are currently in the market to recruit multiple Senior Mechanical Design Engineers (Water) for a variety of major long-term frameworks across the UK. In addition to a range of long-term programmes across the UK water industry RPS, and Tetra Tech, have successfully won a £100 million single-award framework from United Utilities to support the improvement of river health across the Northwest of England. RPS has been working with United Utilities for over 20 years on innovative projects. As we move towards AMP8, this is an exciting time to be working in the water industry, and collaborating with passionate organisations, gives our people the opportunity to create positive change. Under this 10-year framework, RPS will drive program optimisation, develop solutions, and select the preferred options based on best value, lowest carbon, and cost. Our mission is to deliver exceptional water services to foster a...
Omexom Uk
Apr 12, 2026
Principal Design Engineer - Primary
Omexom Uk Choppington, UK
Job Title Principal Design Engineer - Primary Reporting to: Principal Design Engineer/Head of Design. Role purpose The Principal Design Engineer will be responsible for managing and leading projects. A thorough understanding of managing project delivery to quality, cost and programme deliverables. Manage and deliver single- and/or multi-disciplinary projects to cost, schedule and quality criteria. Lead aspects of infrastructure design, work as lead designer on a range of project sizes, appropriate to their experience. The Principal Design Engineer is a key member of the Design Management team. You will assist the Design Manager to ensure technical compliance, quality, and successful delivery of a portfolio of design projects Generating Primary designs and working with other Omexom Engineers in converting these designs into working drawings as part of a wider design team. Have significant knowledge and experience of legislation required in this industry and...
Glanua
Apr 12, 2026
Principle Electrical Design Engineer
Glanua Reading, UK
Principle Electrical Design Engineer - (Wastewater Treatment Projects) About Us: Glanua is an industry leader in providing innovative and sustainable engineering solutions to design, build, operate and maintain critical water and wastewater infrastructure across Ireland and the UK. We are a trusted provider to the municipal and industrial sector where our clients include Ireland and the UK's largest water utilities, Uisce Eireann (formally Irish Water), Thames Water, Yorkshire Water Affinity Water, Northumbrian Water and United Utilities. Glanua is passionate about solving today's environmental challenges and delivering a decarbonised and sustainable world. We know that to build successful creative teams we need a diverse workforce that can deliver new innovative ways of thinking. We provide an environment where you will have the freedom to develop and grow to your full potential. We champion our core values and uphold the highest standards of Safety and Well-being,...
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